Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ff8ba8df2955f2…

MALICIOUS

PDF

69.0 KB Created: 2021-03-05 11:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 45e9537c27d818e313994cf3e944ca56 SHA-1: 9fd56db1f12bf3531b434c7187465b49901af26c SHA-256: 71ff8ba8df2955f2ef7d3ea1692a0fdb15febdcfe03bfaeb7e6710a7567ea905
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external URIs pointing to disposable domains, indicating a link farm designed to obfuscate the true destination and potentially host phishing content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/123?utm_term=brother+ce8080+bobbin PDF link annotation
    • http://micrometerdigital.xyz/31519444518w65hn.pdfIn PDF document text
    • http://kitazixozakabu.sportsontheweb.net/98082646328.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/gjdjbzB/vivi_bubble_tea_popcorn_chicken_calories.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/66443897593.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/percy_jackson_character_traits_in_sea_of_monsters.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/irxjhpx/lojumug.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/24841280569.pdfIn PDF document text
    • http://uscreditcheck.info/choreiform_gait_description5cj3g.pdfIn PDF document text
    • http://tidedejix.iblogger.org/51634133818.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/hibernate_interview_questions_tutorialspoint.pdfIn PDF document text
    • http://fasibada.22web.org/29198840018.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/hjiezfF/bazeva.pdfIn PDF document text
    • http://lnstagramsupportlives.com/losatikukozizobisebezol01i68.pdfIn PDF document text
    • http://vixegoxufareka.getenjoyment.net/how_to_start_fl_studio_20.pdfIn PDF document text
    • https://cdn.sqhk.co/zovigobut/XjbE6ZZ/76479188427.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/59144375101.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_087b4bcb985144e79671ccac2c6ea1df.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_740d97bc311c45fdb45f8cc2c468ddd6.pdf?index=trueIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/bedilegumikegid.pdfIn PDF document text
    • http://poravilotizeve.epizy.com/91012366563.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_1358868cee07493fa07683c9edd32107.pdf?index=trueIn PDF document text
    • http://vomotoboxavixot.epizy.com/nifitenoponifakadavefol.pdfIn PDF document text
    • http://somekifizepu.epizy.com/accept_job_offer_template.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D1 4992 bytes
SHA-256: 19ede5ed89b6e31c85df2286ff95b922c5d6e73f992904f61c95c03c29835949
font_01_sfnt_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 10776 bytes
SHA-256: 96515876a5cc3d13763ec2e4752063cf0b3f0eec0c02ba417196d96769ab058a

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